Question

a) -8x+7=-17

b) 9x-7=7x-15

c) -63:(5x-4)=7




​

Answer 1

Răspuns:

a) -8x+7=-17

-8x=-17-7

-8x=-24

x=24:8

x=3

b) 9x-7=7x-15

9x-7x=-15+7

2x=-8

x=-8:2

x=-4

c) -63:(5x-4)=7

-63=7(5x-4)

-63=35x-28

-63+28=35x

-35=35x

x=-1

Answer 2

Explicație pas cu pas:

$\bf a)~ -8x+7=-17$

$\bf -8x=-17-7$

$\bf -8x=-24~~~~\bigg|:(-8)$

$\bf \purple{\underline{~x=3~}}$

_________________

$\bf b) ~9x-7=7x-15$

$\bf 9x-7-7x=-15$

$\bf 2x-7=-15$

$\bf 2x=-15+7$

$\bf 2x=-8~~~\bigg|:2$

$\blue{\underline{~\bf x=-4~}}$

_________________

$\bf c) ~-63:(5x-4)=7$

$\bf -63= 7\cdot (5x-4)~~~\bigg|:7$

$\bf -9= 5x-4$

$\bf -9+4= 5x$

$\bf -5= 5x~~~\bigg|:5$

$\red{\underline{~\bf x=-1~}}$